Question about triggers for strings

[thenextuser]

Hello,

I have an item which is either empty (has no value) or contains a (different) string.
I now want to fire a trigger as soon as this item is not empty, i.e. as soon as the item contains a string.

Like this:
Item [empty] > all good
Item [string123] > trigger


Unfortunately I can't get this to work.
What is the correct and right way to achieve this.

I'm not getting anywhere here and need help.
Thank you very much for your efforts.


Zabbix version: 5.4
Client running Zabbix agent.

[thenextuser]

Hello,

I have already figured it out.
My tigger is now:

length(last(/host/item))>0

So it works exactly as I want it to.
If the value is empty, no trigger is fired.
If the value contains any string, the trigger is fired.

Maybe this will help someone.
Many greetings.